Leon, 24, dominated as a late reliever at Lexington and was given a mid-season two-level promotion to Class AA Corpus Christi.

The Rule 5 draft, which will be held at the Winter Meetings on Dec. 9, allows players left off the 40-man roster to be claimed for $50,000 by any team if they have had five years in the organization (or four for players who first signed after their 19th birthday).

That player then must remain on the major league active roster or disabled list for a full season or be offered back to his original club at a reduced rate.

With the moves, just ahead of Major League Baseball's deadline for Rule 5 protection, the Astros' 40-man roster is full.